1 /* 2 * Copyright 2019, OpenCensus Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.opencensus.trace.unsafe; 18 19 import static com.google.common.truth.Truth.assertThat; 20 21 import io.opencensus.trace.BlankSpan; 22 import io.opencensus.trace.ContextHandle; 23 import io.opencensus.trace.Span; 24 import org.junit.Test; 25 import org.junit.runner.RunWith; 26 import org.junit.runners.JUnit4; 27 28 /** Unit tests for {@link ContextUtils}. */ 29 @RunWith(JUnit4.class) 30 public class ContextUtilsTest { 31 32 @Test testGetCurrentSpan_DefaultContext()33 public void testGetCurrentSpan_DefaultContext() { 34 Span span = ContextHandleUtils.getValue(ContextHandleUtils.currentContext()); 35 assertThat(span).isEqualTo(BlankSpan.INSTANCE); 36 } 37 38 @Test testGetCurrentSpan_ContextSetToNull()39 public void testGetCurrentSpan_ContextSetToNull() { 40 ContextHandle orig = 41 ContextHandleUtils.withValue(ContextHandleUtils.currentContext(), null).attach(); 42 try { 43 Span span = ContextHandleUtils.getValue(ContextHandleUtils.currentContext()); 44 // ContextUtils.getValue always returns non-null. 45 assertThat(span).isEqualTo(BlankSpan.INSTANCE); 46 } finally { 47 ContextHandleUtils.currentContext().detach(orig); 48 } 49 } 50 51 @Test testTryExtractGrpcContext_WillNotThrow()52 public void testTryExtractGrpcContext_WillNotThrow() { 53 assertThat(ContextHandleUtils.tryExtractGrpcContext(ContextHandleUtils.currentContext())) 54 .isNotNull(); 55 } 56 } 57